Question

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Feature
Previous Test Review Questions


Please read: The following questions are review questions from Units 2 and 3. Remember, your tests are cumulative so you will see material from previous units on all tests.

Question 1
A rock is taken from the Moon back to Earth. Which of the following correctly describes the changes to its mass and weight?(3 points)
Responses

Its mass has no change, and its weight increases.
Its mass has no change, and its weight increases.

Its mass has no change, and its weight decreases.
Its mass has no change, and its weight decreases.

Its mass decreases, and its weight has no change.
Its mass decreases, and its weight has no change.

Its mass increases, and its weight increases.
Its mass increases, and its weight increases.
Question 2
If an object has a mass of 20 kg on a planet with a force of gravity of 4 m/s2. What is the object's weight?

**Remember** W=mg

(3 points)
Responses

80 N
80 N

200 N
200 N

5 N
5 N

0.2 N
0.2 N
Question 3
At which location does the roller-coaster have the greatest amount of kinetic energy?



(3 points)
Responses

A
A

B
B

C
C

D

Answer 1

Here are the answers with brief explanations:

Question 1
Answer: Its mass has no change, and its weight increases.
Why: Mass is intrinsic and doesn't change when you move an object. Weight = mg, and Earth's gravity is stronger than the Moon's, so the weight increases.

Question 2
Answer: 80 N
Why: W = m g = 20 kg × 4 m/s² = 80 N.

Question 3
I can't see the roller-coaster diagram in your message. In general: the roller-coaster has the greatest kinetic energy at the point with the greatest speed — equivalently, the lowest height (smallest gravitational potential energy), since KE = total mechanical energy − mgh. Tell me which labeled point is lowest (or upload the diagram) and I’ll pick the correct letter.